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DC Power Supplies

13.5VDC 2.4A        13.8VDC 3A        12V Battery Charger

13.5VDC 2.4A Switching Power Supply



  • Wide input voltage 90-264 VAC
  • Short circuit  protection
  • Built-in EMI filter
  • Small size, only 0.79" x 1.97" x 4.33"
  • Overvoltage protection
  • 100% Burn-in
  • Approved to UL, cUL, and TUV safety standards

Model Output Maximum
CUP36-12-1 13.5V 0A 2.4A 4% 32W

Run your QRP rigs at full power when you are traveling!  Most rigs are rated at 13.6-13.8V, and power output drops quickly as you get down to 12V, as any battery user knows.  This little gem is a real powerhouse.

We tested the CUP-36 power supply extensively in the Oak Hills Research labs before selecting it as our standard power supply for use with the OHR kits and accessories.  With adequate grounding, we found no trace of either RFI emission or susceptibility over the widest possible variety of loads.  We also found the voltage to be a rock-solid 13.7V over the entire load range-- the 4% tolerance figure relates to the extremes of input voltage and frequency. But note that proper operation of the filter requires your equipment to be grounded (see application note at the bottom of this page).

The CUP-36 is smaller and lighter than a 7Ah gell cell, and will supply 2.4A at 13.5VDC continuous.    With the right AC power cord or adapter you can plug it in anywhere in the world.  The supplied AC cord is two-pin US standard.

The output connector is 2.5mm coaxial, so it will plug right into any OHR transceiver or accessory, as well as many other brands.

only $39.95

13.8VDC 3A Regulated Power Supply



  • Output 13.8VDC at 3A continuous load, 5A surge.
  • Thermal overload protection.
  • Regulated and filtered output.
  • 5-way binding posts (banana plug, straight wire, wire-wrap, spade lug, ring terminal).
  • Illuminated on/off switch.
  • UL/CSA Approved.
  • Weight 5 Lb 9.6 Oz.

only $59.95

Intelligent 12V Lead Acid Battery Charger



Model PST-3P10-12V (3PA1015)
Name 12 Volt charer for lead acid, sealed lead acid, gel cell , etc.
Rated input voltage 90-264 VAC, 50/60 Hz
Battery size 12 volt nominal SLA, VRLA, Gel, AGM, or flooded
Battery size 0.7 AH to 14+ AH
Charging current 0.7 amps or 700 mA max
Charging algorithm Constant current/constant voltage/float
Stage 1 constant current 750 mA 100 mA
Stage 2 constant voltage 14.75 volts 0.25 volts
Stage 3 float charge 13.75 0.25 volts
"Charged" light turns on and float charge starts when the charge current is below 0.20 amps 0.05 amps when the battery charge voltage is above 14 volts.
Style Desktop
Output power 14W maximum
Output voltage 14.75 volts maximum
Output options included Alligator clips 
Weight 150 grams, 0.15 kg, 0.33 pounds, 5 oz
Cooling Natural convection, no fan
Efficiency >75%
Size 75 x 51 x 28 mm, 3 x 2 x 1 inches
Environment -10C to +40C operating, -40C to +70C storage
Temperature rise <40C rise on case under any line voltage and maximum rated load
Vibration, Impact 5mm, 50Hz, 600 Seconds, 1 meter drop 3 times
Protections Reverse Polarity, Short circuit protection
Safety CE marked, designed to ED60950, EN55022B
MTBF 30,000 hours by MIL-STD calculation
HiPot, ESD Hi-Pot 3000 V, 1 minute, ESD 8000V
LED Indications Power on, but no battery connected Black
Charging Red
Charged/Float Charging Green

only $17.95

Order on-line, or call 800-238-8205 for credit card orders
or call 303-752-3382 for more information



Before we published this note, several users complained of RF “hash” emanating from the power supply despite the built-in EMI filter.   In every case the problem was due to an inadequate or nonexistent electrical ground connection on the output side of the supply.

It is the nature of filtering that you have to filter the noise TO someplace,  e.g. ground.  And it is the nature of switching power supplies that they are isolated from the service ground (note that there are only two input power terminals).   Standard practice in amateur radio requires your transmitter to be grounded, and this ground connection is usually adequate to insure proper functioning of the power supply’s EMI filter.  Often a separate “RF ground” connection will be adequate.  If you are experiencing RFI problems you should try creating an “electrical ground” for your radio by running a wire from the radio’s chassis  (e.g. one of the antenna connector mounting screws) to the ground terminal or cover plate on the electrical outlet that you are using with the power supply, or to a convenient water pipe.


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